LTC2335-18
Features
18-Bit, 1Msps 8-Channel
Differential ±10.24V Input SoftSpan ADC
with Wide Input Common Mode Range
Description
nn 1Msps Throughput
nn ±3LSB INL (Maximum, ±10.24V Range)
nn Guaranteed 18-Bit, No Missing Codes
nn Differential, Wide Common Mode Range Inputs
nn 8-Channel Multiplexer with SoftSpan Input Ranges:
±10.24V, 0V to 10.24V, ±5.12V, 0V to 5.12V
±12.5V, 0V to 12.5V, ±6.25V, 0V to 6.25V
nn 96.7dB Single-Conversion SNR (Typical)
nn −109dB THD (Typical) at fIN = 2kHz
nn 118dB CMRR, 125dB Active Crosstalk (Typical)
nn Rail-to-Rail Input Overdrive Tolerance
nn Programmable Sequencer with No-Latency Control
nn Guaranteed Operation to 125°C
nn Integrated Reference and Buffer (4.096V)
nn SPI CMOS (1.8V to 5V) and LVDS Serial I/O
nn No Pipeline Delay, No Cycle Latency
nn 180mW Power Dissipation (Typical)
nn 48-Lead (7mm × 7mm) LQFP Package
Applications
nn Programmable Logic Controllers
nn Industrial Process Control
nn Power Line Monitoring
nn Test and Measurement
The LTC®2335-18 is an 18-bit, low noise 8-channel multi-
plexed successive approximation register (SAR) ADC with
differential, wide common mode range inputs. Operating
from a 5V low voltage supply, flexible high voltage supplies,
and using the internal reference and buffer, this SoftSpanTM
ADC can be configured on a conversion-by-conversion
basis to accept ±10.24V, 0V to 10.24V, ±5.12V, or 0V to
5.12V signals on any channel. Alternately, the ADC may
be programmed to cycle through a sequence of channels
and ranges without further user intervention.
The wide input common mode range and 118dB CMRR of
the LTC2335-18 analog inputs allow the ADC to directly
digitize a variety of signals, simplifying signal chain de-
sign. This input signal flexibility, combined with ±3LSB
INL, no missing codes at 18 bits, and 96.7dB SNR, makes
the LTC2335-18 an ideal choice for many high voltage
applications requiring wide dynamic range.
The LTC2335-18 supports pin-selectable SPI CMOS (1.8V
to 5V) and LVDS serial interfaces.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners. Protected by U.S. Patents, including 7705765, 7961132, 8319673.
Other Patents pending.
Typical Application
ARBITRARY
+10V
0V
–10V
FULLY
DIFFERENTIAL
+5V
0V
–5V
TRUE BIPOLAR
UNIPOLAR
+10V
+10V
0V
0V
–10V
–10V
DIFFERENTIAL INPUTS IN+/IN– WITH
WIDE INPUT COMMON MODE RANGE
15V
5V
0.1µF
0.1µF
2.2µF
1.8V TO 5V
0.1µF
IN0+
VCC
IN0–
MUX
CMOS OR LVDS
I/O INTERFACE
VDD VDDLBYP OVDD LVDS/CMOS
PD
LTC2335-18
18-BIT
SAMPLING
ADC
SDO
SCKO
SCKI
SDI
CS
BUSY
CNV
IINN77+–
VEE REFBUF REFIN GND
0.1µF
–15V
47µF
0.1µF
233518 TA01a
SAMPLE
CLOCK
For more information www.linear.com/LTC2335-18
Integral Nonlinearity vs
Output Code and Channel
2.0
±10.24V RANGE
1.5
TRUE BIPOLAR DRIVE (IN– = 0V)
ALL CHANNELS
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–131072
–65536
0
65536 131072
OUTPUT CODE
233518 TA01b
233518f
1
